//// Source code recreated from a .class file by IntelliJ IDEA// (powered by FernFlower decompiler)//package 力扣.题库.未分类;public class demo_709 {    public demo_709() {    }    public String toLowerCase(String s) {        return s.toLowerCase();    }    public String toLowerCase2(String s) {        StringBuilder sb = new StringBuilder(s);        for(int i = 0; i < sb.length(); ++i) {            if (sb.charAt(i) >= 'A' && sb.charAt(i) <= 'Z') {                sb.insert(i, (char)(sb.charAt(i) + 32));                sb.deleteCharAt(i + 1);            }        }        return sb.toString();    }}